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2 - JBL SRX 828sp and 2 - JBL SRX 812sp
Steve Ball:
Hello,
I'm using 2 JBL SRX 828sp's and 2 JBL SRX 812sp's for my live sound with a Mackie DL1608. It looks like at some points I'm seeing my 812's clip especially when the lead singer is belting something out. Also, my bassist is asking for more bottom end from my system. He says he wants to feel it in his chest if he's out 50 feet in front of the subs. I'm not sure how to accomplish this. I'm a novice at this and love to help out my friends band by running FOH for them at certain shows but need some help from the ones who know. So I was asked to pose these question on this forum in hope of some expert replies.
I'd like to know if coming from my mixer to the subs and then into the 812's is the correct way of connecting this type of system together? I've seen several videos on youtube and other web sites.
I appreciate any help on this issue and setup.
Thank you in advance.
Steve
Matthias McCready:
--- Quote from: Steve Ball on May 26, 2021, 01:04:27 PM ---Hello,
I'm using 2 JBL SRX 828sp's and 2 JBL SRX 812sp's for my live sound with a Mackie DL1608. It looks like at some points I'm seeing my 812's clip especially when the lead singer is belting something out. Also, my bassist is asking for more bottom end from my system. He says he wants to feel it in his chest if he's out 50 feet in front of the subs. I'm not sure how to accomplish this. I'm a novice at this and love to help out my friends band by running FOH for them at certain shows but need some help from the ones who know. So I was asked to pose these question on this forum in hope of some expert replies.
I'd like to know if coming from my mixer to the subs and then into the 812's is the correct way of connecting this type of system together? I've seen several videos on youtube and other web sites.
I appreciate any help on this issue and setup.
Thank you in advance.
Steve
--- End quote ---
Hello Steve,
No great advice (that is for others to give); but have two quick recommendations (if you are not doing this already):
1: Make your 812's DSP is set so they are the with-sub mode (top box)? Forget the name. This will make sure they are not going too low and trying to work hard to what the subs can easily do; this should give them a little more horse power.
2: Place your subs together, rather than L+R. Will almost always give better, more even coverage. In addition it gives you some "free" dB. :)
--
Also:
1) Is this indoors or outdoors?
2) What SPL are you trying to achieve?
3) What is the area (ft or meters) of what you are trying to cover?
Luke Geis:
The clip meter on the 812's is a little pre-mature. They have soft limiting in them and as soon as that engages it illuminates the clip light even though you may not actually be clipping. I found that setting the 812's for the SRX SUB setting helps A LOT in freeing up some headroom. I also turn the master and input channel level all the way up. For the 828, you should use the SRX Top setting and turn the thing all the way up.
As to what your bassist wants, he can't have his cake and eat it too. Making your chest shake at 50' away from a basic PA is not going to happen and honestly for any gig in which a PA this size is employed, shouldn't be a goal. Tell him to get back on stage and play the bass and let you do your job. If he is the one paying your check, kindly give him the check back and go find someone else to work for. It isn't that it is impossible to achieve, it is simply not up to him to make it a requirement.
You can get a little more mileage from the subs by running them from an aux, known simply as Subs on an Aux. You can research the term if you don't already know what I am referring to and employ it if you choose. It free's up a little bit of headroom for the subs allowing you to turn the things of interest in them up a little more. But it won't get you from not enough to more than enough though. It will simply allow you perhaps 3-7db more, which may be enough to go from not enough to just barely enough.
You can try placing the subs together in the center of your bandstand. It will get you a little bit more oomph over a little more area, but it will also put much more low end on the stage, which may not help things. I won't say that it gives you free db's, mainly because you still have the same peak level potential, it is only that it smooths out the comb filtering that subs can have when they are separated, giving them a more even coverage over the dance floor. When the coverage is evened out, it seems like you are getting more output ( you aren't ), because no matter where you are, you can hear the sound more evenly.
Tim McCulloch:
It will take 4x the subs to give the bass player what he wants.
Steve Ball:
--- Quote from: Matthias McCready on May 26, 2021, 02:41:51 PM ---Hello Steve,
No great advice (that is for others to give); but have two quick recommendations (if you are not doing this already):
1: Make your 812's DSP is set so they are the with-sub mode (top box)? Forget the name. This will make sure they are not going too low and trying to work hard to what the subs can easily do; this should give them a little more horse power.
2: Place your subs together, rather than L+R. Will almost always give better, more even coverage. In addition it gives you some "free" dB. :)
--
Also:
1) Is this indoors or outdoors?
2) What SPL are you trying to achieve?
3) What is the area (ft or meters) of what you are trying to cover?
--- End quote ---
Hi Matthias,
I do have my tops set to sub mode.
I have tried both placing the subs together and apart. I do like them together better but in some instance I need to separate them.
This has been mostly for outdoor events but on occasion it is an indoor event.
I'm not real worried about what the bassist wants, I'm just after a full overall sound for the band.
Several times people tell me they sound very good so I'm taking that as a reflection on what I'm doing. :-)
From my explanation of connections, does that sem correct or is there another way?
Thanks again
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